Device for remotely operating and assembly comprising a bean/needle system, and use thereof in a drill string

摘要

PCT No. PCT/FR91/00976 Sec. 371 Date Oct. 20, 1992 Sec. 102(e) Date Oct. 20, 1992 PCT Filed Dec. 6, 1991 PCT Pub. No. WO92/11461 PCT Pub. Date Jul. 9, 1992.A device for remotely operating equipment through a variation in the flow of a fluid includes a coupling unit connecting the device and the equipment to be operated, an assembly of two elements cooperating with one another to control an opening value of a channel through which the fluid flows and a control assembly for adjusting the opening value in order to have it take on one or the other of two particular values.